Example Walkthrough
Say I wanted to put my Singing Steel Boots in the top right slot...  I would:
(1)	Open the EQUI_Container.xml file included in the zip file with Notepad. (How do I open it in Notepad?) Usually Notepad is located in:  Start Menu > Programs > Accessories So, open Notepad and then click on:  File > Open Now navigate yourself to wherever you installed Everquest. The default Everquest folder is located in:  C:\Program Files\Everquest (or trilogy whatever /shrug) You'll want to go to the folder you unzipped my files into. That is usually located at:  C:\Program Files\Everquest\uifiles\containermod or whatever folder you named it Then open EQUI_Container.xml located in that folder
Now I want to put my feet slot in the top right slot...
(2)	I'd scroll down to where I see <!-- START = TOP RIGHT SLOT --> and I would NOT go past <!-- END = TOP RIGHT SLOT --> Now I'll replace where it says... <Background>A_InvEar</Background> <EQType>4</EQType> With the given code from below... <Background>A_InvFeet</Background> <EQType>19</EQType> (What did you just say?  I'm LOST!) This is what I'm talking about...  Replace the code in yellow. <InvSlot item = "Container_TopRightSlot"> <ScreenID>Container_TopRightSlot</ScreenID> <!--<Font>3</Font>--> <RelativePosition>true</RelativePosition> <Location> <X>46</X> <Y>0</Y> </Location> <Size> <CX>40</CX> <CY>40</CY> </Size> <!-- START = TOP RIGHT SLOT --> <Background>A_InvEar</Background> <EQType>4</EQType> <!-- END = TOP RIGHT SLOT --> <Style_VScroll>false</Style_VScroll> <Style_HScroll>false</Style_HScroll> <Style_Transparent>false</Style_Transparent> <!--<TooltipReference/>--> </InvSlot> It should now look like... <InvSlot item = "Container_TopRightSlot"> <ScreenID>Container_TopRightSlot</ScreenID> <!--<Font>3</Font>--> <RelativePosition>true</RelativePosition> <Location> <X>46</X> <Y>0</Y> </Location> <Size> <CX>40</CX> <CY>40</CY> </Size> <!-- START = TOP RIGHT SLOT --> <Background>A_InvFeet</Background> <EQType>19</EQType> <!-- END = TOP RIGHT SLOT --> <Style_VScroll>false</Style_VScroll> <Style_HScroll>false</Style_HScroll> <Style_Transparent>false</Style_Transparent> <!--<TooltipReference/>--> </InvSlot>
Now I want to save my work...
(3)	Click on... File > Save
All done =D

Codes!

AMMO <Background>A_InvAmmo</Background> <EQType>21</EQType> ARMS <Background>A_InvArms</Background> <EQType>7</EQType> BACK <Background>A_InvAboutBody</Background> <EQType>8</EQType> CHEST <Background>A_InvChest</Background> <EQType>17</EQType> FACE <Background>A_InvFace</Background> <EQType>3</EQType> FEET <Background>A_InvFeet</Background> <EQType>19</EQType> HANDS <Background>A_InvHands</Background> <EQType>12</EQType> HEAD <Background>A_InvHead</Background> <EQType>2</EQType> LEFT EAR <Background>A_InvEar</Background> <EQType>1</EQType> LEFT FINGER <Background>A_InvRing</Background> <EQType>15</EQType> LEFT WRIST <Background>A_InvWrist</Background> <EQType>9</EQType> LEGS <Background>A_InvLegs</Background> <EQType>18</EQType> NECK <Background>A_InvNeck</Background> <EQType>5</EQType> PRIMARY WEAPON <Background>A_InvPrimary</Background> <EQType>13</EQType> RANGE WEAPON <Background>A_InvRange</Background> <EQType>11</EQType> RIGHT EAR <Background>A_InvEar</Background> <EQType>4</EQType> RIGHT FINGER <Background>A_InvRing</Background> <EQType>16</EQType> RIGHT WRIST <Background>A_InvWrist</Background> <EQType>10</EQType> SECONDARY WEAPON <Background>A_InvSecondary</Background> <EQType>14</EQType> SHOULDERS <Background>A_InvShoulders</Background> <EQType>6</EQType> WAIST <Background>A_InvWaist</Background> <EQType>20</EQType>